// Copyright (C) 2025 Kumo inc.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

#ifndef ROTHAR_PEGTL_INTERNAL_CSTRING_READER_HPP
#define ROTHAR_PEGTL_INTERNAL_CSTRING_READER_HPP

#include <cassert>
#include <cstddef>

#include "../config.hpp"

namespace rothar::internal
{
   struct cstring_reader
   {
      explicit cstring_reader( const char* zero_terminated ) noexcept
         : m_cstring( zero_terminated )
      {
         assert( m_cstring != nullptr );
      }

      [[nodiscard]] std::size_t operator()( char* buffer, const std::size_t length ) noexcept
      {
         std::size_t i = 0;
         char c;

         while( ( i < length ) && ( ( c = m_cstring[ i ] ) != 0 ) ) {
            *buffer++ = c;
            ++i;
         }
         m_cstring += i;
         return i;
      }

      const char* m_cstring;
   };

}  // namespace rothar::internal

#endif
